题解 | 最长不含重复字符的子字符串

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param s string字符串 
# @return int整型
#
class Solution:
    def lengthOfLongestSubstring(self , s: str) -> int:
        # write code here
        n=len(s)
        dic={}
        left=0
        res=0
        for right,x in enumerate(s):
            if x not in dic:
                dic[x]=1
            else:
                dic[x]+=1
            while dic[s[right]]>=2:
                dic[s[left]]-=1
                left+=1
            res=max(res,right-left+1)
        return res